A look inside the tactics of Definers, Facebook's attack dog

After Times reported its findings about Definers' tactics to discredit Facebook's critics, Mark Zuckerberg cut ties with the firm

A small firm called Definers Public Affairs brought the dark arts of Washington’s back-room politics to Silicon Valley when, while working for Facebook, it began disparaging other tech companies to reporters.

But a few days before Sheryl Sandberg, Facebook’s chief operating officer, testified to Congress in September, Definers set its sights on a different target: the senators about to question Sandberg.

In one document circulated to reporters, Definers tallied what software the 15 members of the Senate Intelligence Committee used to track visitors to their Senate websites. Another document detailed how much each senator spent on Facebook ads and how much they